Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
		Jul. 31, 2016	May 31, 2017	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Financial results included in losses from discontinued operations [Abstract]
Pretax loss on release of cumulative translation adjustment				$ (3,044)		$ 0	$ 0
Income (loss) from discontinued operations, net of income tax benefit				2,485		(184,706)	(74,952)
TPHS Business [Member] | Discontinued Operations, Disposed of by Sale [Member]
Financial results included in losses from discontinued operations [Abstract]
Revenues				0		151,780	318,506
Cost of services				427		173,302	317,849
Selling, general & administrative expenses				349		18,594	32,928
Depreciation and amortization				0		27,207	42,986
Restructuring and related charges				0		8,626	14,395
Equity in income (loss) from joint ventures				98		243	(20,229)
Pretax loss on discontinued operations				(678)		(75,706)	(109,881)
Pretax loss on release of cumulative translation adjustment	[1]			(3,044)		0	0
Pretax gain on sale of Navvis business				0		0	1,873
Pretax loss on sale of MeYou Health business				0		(4,826)	0
Pretax income (loss) on sale of TPHS business				4,733		(202,095)	0
Total pretax income (loss) on discontinued operations				1,011		(282,627)	(108,008)
Income tax benefit				(1,474)	[2]	(97,921)	(33,056)
Income (loss) from discontinued operations, net of income tax benefit				2,485		(184,706)	(74,952)
Significant operating and investing non-cash items of the discontinued operations [Abstract]
Depreciation and amortization				0		27,207	42,986
Capital expenditures				0		10,258	29,984
Assets acquired through capital lease obligations				0		0	898
Share-based compensation				$ 0		$ 10,144	$ 3,404
Sharecare [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash paid to ShareCare at closing		$ 25,000
Remaining payment obligation responsibility percentage				66.67%
Payment obligation included in accrued liabilities				$ 800
Sharecare [Member] | Adjustable Convertible Equity Right [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustable convertible equity right, face amount		$ 30,000	$ 39,800
Conversion period of stock conversion				24 months
Stock issued during period conversion of convertible securities, conversion price (in dollars per share)		$ 249.87
Maximum reduction in face amount of adjustable convertible equity right due to negative cash flows			20,000
Adjustable convertible equity right, face amount net of face value maximum negative cash flow adjustment		$ 10,000
Fair value of adjustable convertible equity right recorded		$ 2,700	2,600	$ 5,500
Net working capital surplus			$ 9,800
Carrying value of adjustable convertible equity right				$ 10,800

[1] During the second quarter of 2017, we substantially liquidated foreign entities that were part of our TPHS business, resulting in a release of the cumulative translation adjustment of $3.0 million into loss from discontinued operations.

[2] Income tax benefit for the year ended December 31, 2017 includes the effect of a change in the estimate of net U.S. tax incurred in 2016 on foreign activity classified as discontinued operations.